Electromagnetic switching system.



L. L. WHITE. v ELECTROMAGNETIC SWITCHING SYSTEM.

APPLIGATION FILED NOV. 4,1912. 1,123,452 P ed an. 5, 1915.

INVENTOR Jazz's-l Wife,

WITNESSES:

ORNEY a an s'rarns PATENT orrron.

LOUIS L. WHITE, OF DORRIS, CALIFORNIA, ASS'IGNOR," TO .PLATINIJ'M ELECTRIC INCU BATOR COMPANY, OF DORRIS, CALIFORNIA, A CORPORATION OF CALIFORNIA.

. ELncrnoMAGNE'rIc swrrcnnve sYsrnM.

1,125,4ion.

Specification of Letters fatent. Patented Jan. 5, 1915.

Application filed November 4, 1912. Ser iaiNo. 729,462.

' To all whom it mag concern:

Dorris,

of California, have invented new Be it known that I, LOUIS L. WHITE, a

citizen of the United States, residing atin the'county of Siskiyou and State.

and useful Improvements in Electromagnetic Switching Systemsgof which the following is a specification.

This invention relates to electric systems,

and particularly to an electrical apparatus involv ng a circuit and means for controlling the opening and closing of said circuit,

said means being sensitive to variations of i temperature.

It is an object of the invention to provide an electric circuit adapted to be thermostatically controlled; the thermostatic apparatus being designed to operate to close a circuit in which may be mounted mechanism which it is desired to actuate at times when there is a variation of temperature.

A further object of the. invention is to provide a simple, reliable, automatic electromagnetic mechanism, designed to operate 25 uated and has conductor terminals 6 for each of the several grad'uations thereof. The conductors 6 are provided with's ockets 11 into which an adjustableplug 10 may" be inserted. The plugs 10 are adapted to con' tact with ground conductors 7 which are provided with binding posts Sand 9. The

1 column of mercury 5 is connected by means of the conductor 12 with a binding post .13. It will be seen, therefore, that the changes in the height of the mercury column due to variations in temperature will result in the closing of the 'circuit controlled by 'eith er one or the other of the plugs 10 and the apparatus having electrical connectiontherewith. J

In the presentflsystem there is shown as running from'thebinding post 8 a conduc tor 16 connected to a magnet 17 thencerunning from the magnet, the conductor 16 is" connected to a circuit closer 18. ,The' arm 18 is normally lifted, as shown, by its spring 19 against the main contact 20, from which wire 21 (a continuation of 16) is directly connected to battery 15; I

For the purpose of illustration assume that bridge post 10 is adjusted at position 108, then when the mercury rises to the corresponding tap 6 a circuit will be completed. comprising parts 6, 10, 7, 8, and 16, magnet 17, line 16 to arm 18, through contact 20, line 21 to battery 15, thence 14 to 13, 1 2-and The function of magnet 17 is to attract its armature 22 and therebyclose a circuit,

having a Wire 23 electrically connected to armature 22- and running to a magnet 251,

wire 27 to anvil 28, when engaged by 'a-rmature 22. "The anvil 20 is provided with a set screw 28 set in a bushing 28 of hard rubber or other non-conducting material. The object of the bushing is to insulate the adjusting screw 28' from the body of the anvil so that an electric circuit will only be com pleted betweenthe armature'andthe anvil when said armature is drawn into contact with the main body of the anvil by the magnet 17. The temperature in the structure or part at which having reached 103 and closed the circuit through magnet 17, whose armature 22 closes the circuitof magnet 24, then jarmathe thermometer 2 is placed ture 25 of the magnet'24 will be attracted, and being linked at 26' to a lever or cra-nktilifa ft 27" will rock this" and throw open a circuit-closing switch 28 connectedfto the crank-shaft. The arm 28- is subjectto' the pull of its spring 29 to hold a carbon 30 against a stationary carbon 31. .The switch arm 28 opens or closes the main heating or lighting circuit, this invention to automatically control.

One line 32 of the circuit to be controlled which it is the purpose of 75 thence by wire 25 to battery 26, thence by.

' connects with the switch arm 28', thence to a generator 33 from which current is led by line 34- to an apparatus, in this 1llustra- 'tion a heatingmedium 35 in an incubator A.

.lVhenthe heat generated in the incubator attains 103, the armature 25 is actuated to throw open the switch 28'. In order to mechanically and positively hold the switch 28 open, a lock consisting of a bolt 36 is arranged to prevent "the immediate' automatic action of spring 29, and while the lock may be placed to perforr" its duty at any desired location, it is convenient to so dispose it that the outer end of armature 25 will be engaged by it. When the armature 25 is actuated to rock shaft 27, the bolt '36is snapped by its spring 37 over the adjacent end of the armature, and this is then restrained .against movement by spring 29,

the switch standing open. Simultaneously with the rocking of the shaft to open switch 28, the shaft carries a circuit breaker 38 against the circuit closer arm 18, thus opening the circuit of magnet 17 which was energized by the thermometer at 103. When the heating medium 35 is deenergized, the temperature will begin to fall int-the incubator and at a'pre'determined degree, say

' 102, then theopposite limb of the mercury will operate to close a circuit through binding post 9 as the mercury reaches the tap Wire at 102".-v From post 9 a circuit is completed through line 40 to magnet l1, thence by line 42 to acircuit closer arm {1:23, which,

by engagement with a contact piece is connected to batteries 15 bya wire 45, completes the circuit over wire 14 to the thermometer.

The function of the magnet 41 is to attract the temperature drops, it is necessary to I again close theheating circuit at -35, so I provide the magnet 48-; under control of the thermometer, to unlock" the switch 28 by ac- V thating bolt 36. The bolt has a magnetic part in the field of the magnet and upon the energization 'of the latter will shift against the force of its spring 37, release armature 25, and allow the spring 29 of the switch 28 to close the heatlng current atthe con tact carbons 80-31. When the shaft 27 is rocked by the'closing of switch 28, the circuit closer arm 4351s moved from engage ment with its contact piece-44 by a circuit breaking arm, 52, thus breaking the circuitin magnet 41. The circuit armatures 22 and 54 are each provided'with springs 53 operating to break electrical contact with the anvils. I t i The several circuit-breaking and-circuitclosing instruments may be provided with a suitable mounting or box, as indicated at B. I

Having thus described my invention,

what I claim and desire to secure by Letters Patent isv r 1. An electromagnetic switching system comprising a switch, an electromagnet for operating said switch, a second electromagnet for locking said switch against movement, a relay having electrical connection with each of said electromagnets for making or. breaking the circuits thereof, a circuit closer arm connected in series with each of sand relays to make or break the clrcults thereof, andan arm carried by said switch for automatically actuating said circuit closer arm.

An electromagnetic switching system for controlling a circuit, comprising in com binatioma base member, a pair of brackets projecting from the base member, a shaft rotatably journaled in the brackets, an arm pivoted to one of the brackets, a contact on the base, a second contact on the arm, a lever on the shaft, an insulated link connecting said arm and sald lever, and means for rotating the shaft to move the lever and them by separate the contacts.

3. An. electromagnetic switching system for controlling a circuit, comprising in combination, a base member, a pair of brackets projecting from the base member, a shaft rotatably journaled in the brackets, an arm pivoted to one of the brackets, a contact on the base, a second contact on the arm, a lever on the shaft, an insulated link connecting said arm'and said lever, means for-rotating the'shaft to move the lever and thereby separate the contacts, said means comprising an electromagnet and its armature, and a second electromagnet in alinement with said armature to control the movement thereof.

i. A circuit closing device comprising the combination with a circuit to be controlled, of a base member, a pair of bearings secured to the base member, a shaft rotatably journaled between said bearings, an arm 'carried by one end of the shaft, a crank carried by the other end of the shaft, an electromagnet for operating said crank to rotate the shaft, a second electromagnet for looking said crank operating mechanism in inoperative position, relays for controlling the circuits to each of said electromagnets, a circuit breaker carried by the shaft intermediate its ends, and a pair ofsecondary' circuit closers, onem serles with each of said i'elays and located on' each side of the my hand in the presence of two subscribing shaft in operative relation with the circuit Witnesses. breaker to be moved thereby, said secondary circuit closers making or breaking the relay 5 circuits when operated bythe circuit Witnesses: breaker. I JoHN H. HERRING,

In testimony whereof I have hereunto set WM. HEALEY.

LOUIS L 

